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Method for producing a cross-linked siloxane network

a technology of cross-linked siloxane and network, which is applied in the field of method for producing a cross-linked siloxane network, can solve the problems of relatively short pot life, low yield, and poor toughness of cross-linked silicone polymers, and achieves relatively high mass loss and contributes to the cost of these polymers

Active Publication Date: 2020-05-19
MILLIKEN & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a method for making a cross-linked siloxane network by combining a first part containing a first siloxane compound and a second siloxane compound, a second part containing a hydroxide salt, and heating the mixture. The method allows for the creation of a cross-linked siloxane network with specific physical and mechanical properties.

Problems solved by technology

The hydrosilylation reaction typically is catalyzed by platinum, which contributes to the cost of these polymers since the platinum cannot be recovered from the cured elastomer.
However, the strong base often causes the system to react too fast, resulting in relatively short pot life.
Furthermore, these cross-linked silicone polymers can exhibit poor toughness and relatively high mass loss during high temperature ageing.

Method used

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  • Method for producing a cross-linked siloxane network
  • Method for producing a cross-linked siloxane network
  • Method for producing a cross-linked siloxane network

Examples

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example 1

[0086]This example demonstrates the production of a composition according to the invention and the production of a cross-linked silicone elastomer from the composition.

[0087]A series of six first parts (“Part A-1” through “Part A-6”) were prepared by combining (i) a siloxane compound comprising cyclotrisiloxane repeating units conforming to the structure of Formula (XL), (ii) a siloxane compound conforming to the structure of Formula (XX), and (iii) a siloxane compound comprising siloxane moieties of Formula (LXXX) and / or siloxane moieties of Formula (XC). In each of the first parts, the siloxane compound comprising cyclotrisiloxane repeating units conforming to the structure of Formula (XL) was a polymer having a mass average molar mass of approximately 15,000 g / mol. In the repeating units conforming to the structure of Formula (XL), the groups R41 and R42 were methyl groups, and the groups R43 and R44 were phenyl groups. In addition to the repeating units conforming to the structu...

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Abstract

A method for producing a cross-linked siloxane network comprises the steps of: (a) providing a first part comprising (i) a first siloxane compound comprising at least one cyclic siloxane moiety and (ii) a second siloxane compound comprising a plurality of siloxane moieties, (b) providing a second part, the second part comprising a hydroxide salt, (c) combining the first part and the second part to produce a reaction mixture, (d) heating the reaction mixture to a temperature sufficient for the hydroxide salt to open the ring of the cyclic siloxane moiety, and (e) maintaining the reaction mixture at an elevated temperature so that at least a portion of the opened cyclic siloxane moieties react to produce a cross-linked siloxane network.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims, pursuant to 35 U.S.C. § 119(e), priority to and the benefit of the filing date of U.S. Patent Application No. 62 / 433,457 filed on Dec. 13, 2016, which application is hereby incorporated by reference in its entirety.TECHNICAL FIELD OF THE INVENTION[0002]This application is directed to a method for producing a cross-linked siloxane network, such as those found in silicone elastomers.BACKGROUND[0003]Siloxane compounds and silicones have found many uses in modern industry. For example, siloxane compounds are widely used in the production of cross-linked silicone polymers. These polymers typically are produced by either a hydrosilylation reaction or a condensation reaction. In the hydrosilylation reaction, siloxane compounds bearing vinyl groups undergo addition to link individual molecules of the compounds through the formation of new Si—C bonds. The hydrosilylation reaction typically is catalyzed by platinum, which c...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08G77/08C08L83/04C08G77/00C08G77/04C08G77/16
CPCC08G77/06C08G77/045C08G77/08C08G77/16C08L83/04C08G77/80C08L83/00C08K3/20
Inventor WANG, YUNZHANGYU, XINFEISTAPLETON, RUSSELL A.WILSON, MICHAEL E.TORRES, EDUARDOSRIVASTAVA, SUDHANSHULAWSON, RICHARDHANSSEN, ROBBIE W. J. M.
Owner MILLIKEN & CO